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   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright © 2001-2007 Red Hat, Inc.
   5  *
   6  * Created by David Woodhouse <dwmw2@infradead.org>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/compiler.h>
  16 #include <linux/crc32.h>
  17 #include <linux/sched.h>
  18 #include <linux/pagemap.h>
  19 #include "nodelist.h"
  20
  21 struct erase_priv_struct {
  22         struct jffs2_eraseblock *jeb;
  23         struct jffs2_sb_info *c;
  24 };
  25
  26 #ifndef __ECOS
  27 static void jffs2_erase_callback(struct erase_info *);
  28 #endif
  29 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset);
  30 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
  31 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
  32
  33 static void jffs2_erase_block(struct jffs2_sb_info *c,
  34                               struct jffs2_eraseblock *jeb)
  35 {
  36         int ret;
  37         uint32_t bad_offset;
  38 #ifdef __ECOS
  39        ret = jffs2_flash_erase(c, jeb);
  40        if (!ret) {
  41                jffs2_erase_succeeded(c, jeb);
  42                return;
  43        }
  44        bad_offset = jeb->offset;
  45 #else /* Linux */
  46         struct erase_info *instr;
  47
  48         D1(printk(KERN_DEBUG "jffs2_erase_block(): erase block %#08x (range %#08x-%#08x)\n",
  49                                 jeb->offset, jeb->offset, jeb->offset + c->sector_size));
  50         instr = kmalloc(sizeof(struct erase_info) + sizeof(struct erase_priv_struct), GFP_KERNEL);
  51         if (!instr) {
  52                 printk(KERN_WARNING "kmalloc for struct erase_info in jffs2_erase_block failed. Refiling block for later\n");
  53                 down(&c->erase_free_sem);
  54                 spin_lock(&c->erase_completion_lock);
  55                 list_move(&jeb->list, &c->erase_pending_list);
  56                 c->erasing_size -= c->sector_size;
  57                 c->dirty_size += c->sector_size;
  58                 jeb->dirty_size = c->sector_size;
  59                 spin_unlock(&c->erase_completion_lock);
  60                 up(&c->erase_free_sem);
  61                 return;
  62         }
  63
  64         memset(instr, 0, sizeof(*instr));
  65
  66         instr->mtd = c->mtd;
  67         instr->addr = jeb->offset;
  68         instr->len = c->sector_size;
  69         instr->callback = jffs2_erase_callback;
  70         instr->priv = (unsigned long)(&instr[1]);
  71         instr->fail_addr = 0xffffffff;
  72
  73         ((struct erase_priv_struct *)instr->priv)->jeb = jeb;
  74         ((struct erase_priv_struct *)instr->priv)->c = c;
  75
  76         ret = c->mtd->erase(c->mtd, instr);
  77         if (!ret)
  78                 return;
  79
  80         bad_offset = instr->fail_addr;
  81         kfree(instr);
  82 #endif /* __ECOS */
  83
  84         if (ret == -ENOMEM || ret == -EAGAIN) {
  85                 /* Erase failed immediately. Refile it on the list */
  86                 D1(printk(KERN_DEBUG "Erase at 0x%08x failed: %d. Refiling on erase_pending_list\n", jeb->offset, ret));
  87                 down(&c->erase_free_sem);
  88                 spin_lock(&c->erase_completion_lock);
  89                 list_move(&jeb->list, &c->erase_pending_list);
  90                 c->erasing_size -= c->sector_size;
  91                 c->dirty_size += c->sector_size;
  92                 jeb->dirty_size = c->sector_size;
  93                 spin_unlock(&c->erase_completion_lock);
  94                 up(&c->erase_free_sem);
  95                 return;
  96         }
  97
  98         if (ret == -EROFS)
  99                 printk(KERN_WARNING "Erase at 0x%08x failed immediately: -EROFS. Is the sector locked?\n", jeb->offset);
 100         else
 101                 printk(KERN_WARNING "Erase at 0x%08x failed immediately: errno %d\n", jeb->offset, ret);
 102
 103         jffs2_erase_failed(c, jeb, bad_offset);
 104 }
 105
 106 void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
 107 {
 108         struct jffs2_eraseblock *jeb;
 109
 110         down(&c->erase_free_sem);
 111
 112         spin_lock(&c->erase_completion_lock);
 113
 114         while (!list_empty(&c->erase_complete_list) ||
 115                !list_empty(&c->erase_pending_list)) {
 116
 117                 if (!list_empty(&c->erase_complete_list)) {
 118                         jeb = list_entry(c->erase_complete_list.next, struct jffs2_eraseblock, list);
 119                         list_del(&jeb->list);
 120                         spin_unlock(&c->erase_completion_lock);
 121                         up(&c->erase_free_sem);
 122                         jffs2_mark_erased_block(c, jeb);
 123
 124                         if (!--count) {
 125                                 D1(printk(KERN_DEBUG "Count reached. jffs2_erase_pending_blocks leaving\n"));
 126                                 goto done;
 127                         }
 128
 129                 } else if (!list_empty(&c->erase_pending_list)) {
 130                         jeb = list_entry(c->erase_pending_list.next, struct jffs2_eraseblock, list);
 131                         D1(printk(KERN_DEBUG "Starting erase of pending block 0x%08x\n", jeb->offset));
 132                         list_del(&jeb->list);
 133                         c->erasing_size += c->sector_size;
 134                         c->wasted_size -= jeb->wasted_size;
 135                         c->free_size -= jeb->free_size;
 136                         c->used_size -= jeb->used_size;
 137                         c->dirty_size -= jeb->dirty_size;
 138                         jeb->wasted_size = jeb->used_size = jeb->dirty_size = jeb->free_size = 0;
 139                         jffs2_free_jeb_node_refs(c, jeb);
 140                         list_add(&jeb->list, &c->erasing_list);
 141                         spin_unlock(&c->erase_completion_lock);
 142                         up(&c->erase_free_sem);
 143
 144                         jffs2_erase_block(c, jeb);
 145
 146                 } else {
 147                         BUG();
 148                 }
 149
 150                 /* Be nice */
 151                 yield();
 152                 down(&c->erase_free_sem);
 153                 spin_lock(&c->erase_completion_lock);
 154         }
 155
 156         spin_unlock(&c->erase_completion_lock);
 157         up(&c->erase_free_sem);
 158  done:
 159         D1(printk(KERN_DEBUG "jffs2_erase_pending_blocks completed\n"));
 160 }
 161
 162 static void jffs2_erase_succeeded(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 163 {
 164         D1(printk(KERN_DEBUG "Erase completed successfully at 0x%08x\n", jeb->offset));
 165         down(&c->erase_free_sem);
 166         spin_lock(&c->erase_completion_lock);
 167         list_move_tail(&jeb->list, &c->erase_complete_list);
 168         spin_unlock(&c->erase_completion_lock);
 169         up(&c->erase_free_sem);
 170         /* Ensure that kupdated calls us again to mark them clean */
 171         jffs2_erase_pending_trigger(c);
 172 }
 173
 174 static void jffs2_erase_failed(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
 175 {
 176         /* For NAND, if the failure did not occur at the device level for a
 177            specific physical page, don't bother updating the bad block table. */
 178         if (jffs2_cleanmarker_oob(c) && (bad_offset != 0xffffffff)) {
 179                 /* We had a device-level failure to erase.  Let's see if we've
 180                    failed too many times. */
 181                 if (!jffs2_write_nand_badblock(c, jeb, bad_offset)) {
 182                         /* We'd like to give this block another try. */
 183                         down(&c->erase_free_sem);
 184                         spin_lock(&c->erase_completion_lock);
 185                         list_move(&jeb->list, &c->erase_pending_list);
 186                         c->erasing_size -= c->sector_size;
 187                         c->dirty_size += c->sector_size;
 188                         jeb->dirty_size = c->sector_size;
 189                         spin_unlock(&c->erase_completion_lock);
 190                         up(&c->erase_free_sem);
 191                         return;
 192                 }
 193         }
 194
 195         down(&c->erase_free_sem);
 196         spin_lock(&c->erase_completion_lock);
 197         c->erasing_size -= c->sector_size;
 198         c->bad_size += c->sector_size;
 199         list_move(&jeb->list, &c->bad_list);
 200         c->nr_erasing_blocks--;
 201         spin_unlock(&c->erase_completion_lock);
 202         up(&c->erase_free_sem);
 203         wake_up(&c->erase_wait);
 204 }
 205
 206 #ifndef __ECOS
 207 static void jffs2_erase_callback(struct erase_info *instr)
 208 {
 209         struct erase_priv_struct *priv = (void *)instr->priv;
 210
 211         if(instr->state != MTD_ERASE_DONE) {
 212                 printk(KERN_WARNING "Erase at 0x%08x finished, but state != MTD_ERASE_DONE. State is 0x%x instead.\n", instr->addr, instr->state);
 213                 jffs2_erase_failed(priv->c, priv->jeb, instr->fail_addr);
 214         } else {
 215                 jffs2_erase_succeeded(priv->c, priv->jeb);
 216         }
 217         kfree(instr);
 218 }
 219 #endif /* !__ECOS */
 220
 221 /* Hmmm. Maybe we should accept the extra space it takes and make
 222    this a standard doubly-linked list? */
 223 static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
 224                         struct jffs2_raw_node_ref *ref, struct jffs2_eraseblock *jeb)
 225 {
 226         struct jffs2_inode_cache *ic = NULL;
 227         struct jffs2_raw_node_ref **prev;
 228
 229         prev = &ref->next_in_ino;
 230
 231         /* Walk the inode's list once, removing any nodes from this eraseblock */
 232         while (1) {
 233                 if (!(*prev)->next_in_ino) {
 234                         /* We're looking at the jffs2_inode_cache, which is
 235                            at the end of the linked list. Stash it and continue
 236                            from the beginning of the list */
 237                         ic = (struct jffs2_inode_cache *)(*prev);
 238                         prev = &ic->nodes;
 239                         continue;
 240                 }
 241
 242                 if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
 243                         /* It's in the block we're erasing */
 244                         struct jffs2_raw_node_ref *this;
 245
 246                         this = *prev;
 247                         *prev = this->next_in_ino;
 248                         this->next_in_ino = NULL;
 249
 250                         if (this == ref)
 251                                 break;
 252
 253                         continue;
 254                 }
 255                 /* Not to be deleted. Skip */
 256                 prev = &((*prev)->next_in_ino);
 257         }
 258
 259         /* PARANOIA */
 260         if (!ic) {
 261                 JFFS2_WARNING("inode_cache/xattr_datum/xattr_ref"
 262                               " not found in remove_node_refs()!!\n");
 263                 return;
 264         }
 265
 266         D1(printk(KERN_DEBUG "Removed nodes in range 0x%08x-0x%08x from ino #%u\n",
 267                   jeb->offset, jeb->offset + c->sector_size, ic->ino));
 268
 269         D2({
 270                 int i=0;
 271                 struct jffs2_raw_node_ref *this;
 272                 printk(KERN_DEBUG "After remove_node_refs_from_ino_list: \n" KERN_DEBUG);
 273
 274                 this = ic->nodes;
 275
 276                 while(this) {
 277                         printk( "0x%08x(%d)->", ref_offset(this), ref_flags(this));
 278                         if (++i == 5) {
 279                                 printk("\n" KERN_DEBUG);
 280                                 i=0;
 281                         }
 282                         this = this->next_in_ino;
 283                 }
 284                 printk("\n");
 285         });
 286
 287         switch (ic->class) {
 288 #ifdef CONFIG_JFFS2_FS_XATTR
 289                 case RAWNODE_CLASS_XATTR_DATUM:
 290                         jffs2_release_xattr_datum(c, (struct jffs2_xattr_datum *)ic);
 291                         break;
 292                 case RAWNODE_CLASS_XATTR_REF:
 293                         jffs2_release_xattr_ref(c, (struct jffs2_xattr_ref *)ic);
 294                         break;
 295 #endif
 296                 default:
 297                         if (ic->nodes == (void *)ic && ic->nlink == 0)
 298                                 jffs2_del_ino_cache(c, ic);
 299         }
 300 }
 301
 302 void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 303 {
 304         struct jffs2_raw_node_ref *block, *ref;
 305         D1(printk(KERN_DEBUG "Freeing all node refs for eraseblock offset 0x%08x\n", jeb->offset));
 306
 307         block = ref = jeb->first_node;
 308
 309         while (ref) {
 310                 if (ref->flash_offset == REF_LINK_NODE) {
 311                         ref = ref->next_in_ino;
 312                         jffs2_free_refblock(block);
 313                         block = ref;
 314                         continue;
 315                 }
 316                 if (ref->flash_offset != REF_EMPTY_NODE && ref->next_in_ino)
 317                         jffs2_remove_node_refs_from_ino_list(c, ref, jeb);
 318                 /* else it was a non-inode node or already removed, so don't bother */
 319
 320                 ref++;
 321         }
 322         jeb->first_node = jeb->last_node = NULL;
 323 }
 324
 325 static int jffs2_block_check_erase(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t *bad_offset)
 326 {
 327         void *ebuf;
 328         uint32_t ofs;
 329         size_t retlen;
 330         int ret = -EIO;
 331
 332         if (c->mtd->point) {
 333                 unsigned long *wordebuf;
 334
 335                 ret = c->mtd->point(c->mtd, jeb->offset, c->sector_size, &retlen, (unsigned char **)&ebuf);
 336                 if (ret) {
 337                         D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
 338                         goto do_flash_read;
 339                 }
 340                 if (retlen < c->sector_size) {
 341                         /* Don't muck about if it won't let us point to the whole erase sector */
 342                         D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", retlen));
 343                         c->mtd->unpoint(c->mtd, ebuf, jeb->offset, c->sector_size);
 344                         goto do_flash_read;
 345                 }
 346                 wordebuf = ebuf-sizeof(*wordebuf);
 347                 retlen /= sizeof(*wordebuf);
 348                 do {
 349                    if (*++wordebuf != ~0)
 350                            break;
 351                 } while(--retlen);
 352                 c->mtd->unpoint(c->mtd, ebuf, jeb->offset, c->sector_size);
 353                 if (retlen)
 354                         printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n",
 355                                *wordebuf, jeb->offset + c->sector_size-retlen*sizeof(*wordebuf));
 356                 return 0;
 357         }
 358  do_flash_read:
 359         ebuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 360         if (!ebuf) {
 361                 printk(KERN_WARNING "Failed to allocate page buffer for verifying erase at 0x%08x. Refiling\n", jeb->offset);
 362                 return -EAGAIN;
 363         }
 364
 365         D1(printk(KERN_DEBUG "Verifying erase at 0x%08x\n", jeb->offset));
 366
 367         for (ofs = jeb->offset; ofs < jeb->offset + c->sector_size; ) {
 368                 uint32_t readlen = min((uint32_t)PAGE_SIZE, jeb->offset + c->sector_size - ofs);
 369                 int i;
 370
 371                 *bad_offset = ofs;
 372
 373                 ret = c->mtd->read(c->mtd, ofs, readlen, &retlen, ebuf);
 374                 if (ret) {
 375                         printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
 376                         goto fail;
 377                 }
 378                 if (retlen != readlen) {
 379                         printk(KERN_WARNING "Short read from newly-erased block at 0x%08x. Wanted %d, got %zd\n", ofs, readlen, retlen);
 380                         goto fail;
 381                 }
 382                 for (i=0; i<readlen; i += sizeof(unsigned long)) {
 383                         /* It's OK. We know it's properly aligned */
 384                         unsigned long *datum = ebuf + i;
 385                         if (*datum + 1) {
 386                                 *bad_offset += i;
 387                                 printk(KERN_WARNING "Newly-erased block contained word 0x%lx at offset 0x%08x\n", *datum, *bad_offset);
 388                                 goto fail;
 389                         }
 390                 }
 391                 ofs += readlen;
 392                 cond_resched();
 393         }
 394         ret = 0;
 395 fail:
 396         kfree(ebuf);
 397         return ret;
 398 }
 399
 400 static void jffs2_mark_erased_block(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
 401 {
 402         size_t retlen;
 403         int ret;
 404         uint32_t bad_offset;
 405
 406         switch (jffs2_block_check_erase(c, jeb, &bad_offset)) {
 407         case -EAGAIN:   goto refile;
 408         case -EIO:      goto filebad;
 409         }
 410
 411         /* Write the erase complete marker */
 412         D1(printk(KERN_DEBUG "Writing erased marker to block at 0x%08x\n", jeb->offset));
 413         bad_offset = jeb->offset;
 414
 415         /* Cleanmarker in oob area or no cleanmarker at all ? */
 416         if (jffs2_cleanmarker_oob(c) || c->cleanmarker_size == 0) {
 417
 418                 if (jffs2_cleanmarker_oob(c)) {
 419                         if (jffs2_write_nand_cleanmarker(c, jeb))
 420                                 goto filebad;
 421                 }
 422
 423                 /* Everything else got zeroed before the erase */
 424                 jeb->free_size = c->sector_size;
 425         } else {
 426
 427                 struct kvec vecs[1];
 428                 struct jffs2_unknown_node marker = {
 429                         .magic =        cpu_to_je16(JFFS2_MAGIC_BITMASK),
 430                         .nodetype =     cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
 431                         .totlen =       cpu_to_je32(c->cleanmarker_size)
 432                 };
 433
 434                 jffs2_prealloc_raw_node_refs(c, jeb, 1);
 435
 436                 marker.hdr_crc = cpu_to_je32(crc32(0, &marker, sizeof(struct jffs2_unknown_node)-4));
 437
 438                 vecs[0].iov_base = (unsigned char *) &marker;
 439                 vecs[0].iov_len = sizeof(marker);
 440                 ret = jffs2_flash_direct_writev(c, vecs, 1, jeb->offset, &retlen);
 441
 442                 if (ret || retlen != sizeof(marker)) {
 443                         if (ret)
 444                                 printk(KERN_WARNING "Write clean marker to block at 0x%08x failed: %d\n",
 445                                        jeb->offset, ret);
 446                         else
 447                                 printk(KERN_WARNING "Short write to newly-erased block at 0x%08x: Wanted %zd, got %zd\n",
 448                                        jeb->offset, sizeof(marker), retlen);
 449
 450                         goto filebad;
 451                 }
 452
 453                 /* Everything else got zeroed before the erase */
 454                 jeb->free_size = c->sector_size;
 455                 /* FIXME Special case for cleanmarker in empty block */
 456                 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, c->cleanmarker_size, NULL);
 457         }
 458
 459         down(&c->erase_free_sem);
 460         spin_lock(&c->erase_completion_lock);
 461         c->erasing_size -= c->sector_size;
 462         c->free_size += jeb->free_size;
 463         c->used_size += jeb->used_size;
 464
 465         jffs2_dbg_acct_sanity_check_nolock(c,jeb);
 466         jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
 467
 468         list_add_tail(&jeb->list, &c->free_list);
 469         c->nr_erasing_blocks--;
 470         c->nr_free_blocks++;
 471         spin_unlock(&c->erase_completion_lock);
 472         up(&c->erase_free_sem);
 473         wake_up(&c->erase_wait);
 474         return;
 475
 476 filebad:
 477         down(&c->erase_free_sem);
 478         spin_lock(&c->erase_completion_lock);
 479         /* Stick it on a list (any list) so erase_failed can take it
 480            right off again.  Silly, but shouldn't happen often. */
 481         list_add(&jeb->list, &c->erasing_list);
 482         spin_unlock(&c->erase_completion_lock);
 483         up(&c->erase_free_sem);
 484         jffs2_erase_failed(c, jeb, bad_offset);
 485         return;
 486
 487 refile:
 488         /* Stick it back on the list from whence it came and come back later */
 489         jffs2_erase_pending_trigger(c);
 490         down(&c->erase_free_sem);
 491         spin_lock(&c->erase_completion_lock);
 492         list_add(&jeb->list, &c->erase_complete_list);
 493         spin_unlock(&c->erase_completion_lock);
 494         up(&c->erase_free_sem);
 495         return;
 496 }